The Israel Defense Forces (IDF) on Sunday said it has uncovered "the biggest Hamas tunnel" in Gaza, spanning a length of four kilometers (2.5 miles). The IDF said the tunnel, secured "a few weeks ago" ...

Space might seem like an empty, featureless void, but new research has shown that this is far from true. Scientists have discovered an 'interstellar tunnel' that connects our solar system to distant ...

Pittsburgh’s Liberty Tunnels Ventilation System is now an American Society of Civil Engineers (ASCE) National Historic Civil ...

The Allegheny County Sanitary Authority has released new details about a 16.5-mile tunnel system to be built under Pittsburgh and the three rivers to better manage sewage and stormwater runoff. The ...